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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '354961bd67718c7b74bab1a09bd6216392712e48e382a935976493d4b0249e40' 
  AND token = 'bbNUTjWX2RC69ITXkptmeyhBZajrn3ddIjHYcsVywLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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