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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5c7c77b15e603f2a785094ecb7ecc61a4a8ef286e8876b1f218984aa09de00' 
  AND token = 'f12mF7QE3ZxGrAhgAuusEhxxBuhdy4N/V79iawqhxxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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