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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b6a2e98fc762f78bc08bff8de578cc3c3a63e588ccc28329d08d9deec3f1e5' 
  AND token = 'FY82Qg32iyICrRGbbWeFWgjPIkbpYfcH9tHzxaW1tiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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