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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0b6f1a1fbf4d0ac9761fd9ada1e78216f6ea2e92d046ddc4945ce5efa5026c' 
  AND token = 'vMvBl8x+xlBuRebsPgi0oS/QZTBpFHR+0dQXE/VZ1N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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