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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f658b2ab875cf4f3d6b9076972699a53b8f1d363519c8d72b8acadd570ca56' 
  AND token = '2CUFpk9BgBlo8VQXsYCCvmbVYv/gXUrBAB8BE3Oxb78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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