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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d26ae9a99df6e001b041f2ff98e768f5ce3ba0b98a8cfc5d7ea0046419ee5c' 
  AND token = '9dXGzenDeyT0exLgxYkoHWMN197L4losMl5bh93ENIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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