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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afeb57f7890a0d3415142dcaa96dffcbe85003cb274c19f442160eb5891fc92c' 
  AND token = '4AXEi+ui34NIZW3vw3VpAOwL+31uLMoBQ7tuGv1W7Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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