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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8317306ec4b5b2d077e8c0d61d739e22786f95e1c2e356a83976236de15480b6' 
  AND token = 'FsSVIOaa2+nLYwelpgVBv5ABQhTlMeNPy+Kro6km9Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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