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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f229765070135e790aec6e02b0bab0d6ae23f5ee278fd6b3ad622a2f91a181c5' 
  AND token = 'hxQCa/H6Vq9iKBJ56FGPfCSx8ZhypsAZpj2jGTJp2L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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