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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9213f03028f0e19acc643386bbce17be8d5e5e9878c9a494face1359a2e9775' 
  AND token = 'Of3B6YEgq24Kjy45XIF7ZDyncmPYJ3w0plNaYdeLkoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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