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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a6cbc24a709986f25a2511ac42813f35bf5efe7718644c4383973c3d8a75a32' 
  AND token = 'bvq1po5Q0t/kSs/xiRU/MYwHPpeJ+fa06Ff4SxdjYcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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