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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55a1c7e71a3880b70e62e9781cfa36d8c0c3916a44c9190f7b1636e01bac58d' 
  AND token = 'tbc7UHhVnp6JtZ0ChtSyB+joX5urJxMWjBcT7G/mRUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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