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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4724ed3f070200f7a1158f8eebbfd4fd4b2965d67233a88e8eab51fd373878ba' 
  AND token = 's1JbR+SDkPAH1hxuqzDAKkmJFZ7kvUcqFEYfFmUk5RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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