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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a8aecd14f40650b9ac97f6cace01203b514df493213e6a623bea115a221e56b' 
  AND token = 'Ks7M5iD9NcKBWJnRwlHoSph5TxUkQov+phrz2SwIbIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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