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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06e848c42ed4077695b79f2a1b587b7b5eebf0d8053fc2fffdaa29d6524c194' 
  AND token = '+fySEbB7+1h1F5IHAITtfl+bvpLlT7dqk06De62iyOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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