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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa07cfab95d239f0fca9908d054d6fdd0d3c2353d32d933a0873d43bde2df73' 
  AND token = 'iUJNm16M16vqtFZr5CppfOhwUZ9+Wga1bWx9cnaf92A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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