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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2fd2c42d9c01d09b04b0e8d0b62e57af87542577e0c70abad43064836d217c' 
  AND token = '6NfNLPgoKc35aNyLTgqYYpypbrUTLi8BMfcll1yn+lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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