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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7e616f06c209f129cd58717c652737c71197fb23d49048a157ef714bd436c1' 
  AND token = 'c3In6o80gjCrX0gUE4JSDvxAZ3fZGXiyB/SfWwHRLTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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