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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b814ee56b3764d0ba0f21dc26eee45e82a248d3d3e60a87e0c4472e6fbb6a8a' 
  AND token = '7/UCVo6BfDI2itAB1AEzYtPYsfnRv5Y+4Ac7BrGj/Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00131

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}