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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917089a1c7abe1e9abfa63a04bf6055c96ffe987ac9ba6b5e44bfc50fe7d2ef3' 
  AND token = 'u/LsyuvmGwQD08iivley/0NoGX5Tp329jzmH35+171w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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