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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8fccca0d56609a3a96e5548a7e92d29a975103948754ec89a0d273f94d2ef63' 
  AND token = '74MF5PGvHbiEeRWyN4xj4jGJyqc29PjbCwZsRri8akA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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