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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4c1b6aa1983f6c676a717be8173318ed37f57bec3384436498e21274f34d93' 
  AND token = 'arsC+3Z5gJ2lxy4rZp1I+zQeWYRTHESOokb73uisY+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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