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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631bc17cb291ac8002ac4e124f9c98630d527c45bb3d222874b90b02b0487e64' 
  AND token = '5PESm+IidaqAp7tStSRV+oQ+xaeLrRBXw8Qb3P65J50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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