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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea1b28b077b16b58310473b67d23a0ff4e47697abcd04437c4dc101af2e4aaf2' 
  AND token = 'bCTy3DkHSaA8BIY9VLd0g44yrIkNtKc87ws9bnKC/ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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