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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdacc7d0ff081a2c794ee7f203cdb82e173a67438aaef72add80588d45679c0d' 
  AND token = 'oeEuGZAw9Ua8QcAwbGVCqXFgmCnAYpfcmY/EO4PYfeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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