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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f543d036f35591f07d0d5ac4b27b4846a1155349cf92072c3cc9ed34209197' 
  AND token = 'OyM/0uoxjLjqW6WMPqpCBs6dBDki9/Z/MmCacCGinLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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