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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f4849351274cedd78f8be9393f96e7c348ad7758ebb803ee49282a592e88b4' 
  AND token = 'hhGlwSNkTOkELrZvPUys3EdxPRljWyG7PSHF6nPuy+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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