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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b418b842d4ab0d2d1f5930afe05af4d2d53eb786338e1674476fc0c4271d83' 
  AND token = 'f+nxf8iDMEnFYHxgVHc3N8MZwx6kf7vnstXw6psA7hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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