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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c4646170cf915a13480ccd7a704ff081ea50e3cbd54a61db9a68215411f70f' 
  AND token = 'BailXv8l9pFk30A/FC1sA7BnFz2jIz/T9NvuR/vLc/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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