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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac3ed41f9ac725acaef1a34ce9b87493c9fc955d6fb49eb8be7fe20c53a2df3' 
  AND token = 'M2AsanzS47BgQKUL0a4C8GLeDe4XO9X5oiDWohfw7aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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