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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96091aae48e7c6ff1ebfd8ec239deda2e06d111e90ae7fbcbb93def78db8ee83' 
  AND token = 'jVvI8a0M4zLj3UYAv1y25EgnMaIIQLNN+ncXw7oP0jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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