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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96bbe48d0f797992a0e9a9bc364aab41c76c0d47eb174f84a94e463c508aaccf' 
  AND token = 'rs9ezt9u2XzLnVyij5W82zKBAOInz5H2phRI6aO7SiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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