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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d65917f5021b262aac403c756e96758045194d4a16a645ace4624cb05dcf29' 
  AND token = 'zuzuo4ECrq1F69RMqy0nS3V4BNtuOcF2r/6xp/wakko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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