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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd24f3d58f397758c33ac2ba1e14fc10d80461c5a0d1bca8d783a69073bdb67' 
  AND token = 'r0AUkVLqxiE21aFMegibpjIdxYW3ffvWQMUQosZeIME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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