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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2978ee7d5b2f0cd9dd55aa908863071ea110a07fc4931981882c2393ead2e4' 
  AND token = 'ys+fanKTUBlMJHrlA/7jIWg39jUMKPBp35NPR9545Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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