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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3771c8059df3a0a7396073aed12d6f9aca33791e96d3bc785ca85665740243' 
  AND token = 'uzjWNFRwziD+37zguI5JxbtylvgFt902oUm55fFYR/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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