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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6d8a20307c01ff38a03c45885991b3a310450f7eb2f9aecbcb4399c29c4f77' 
  AND token = 'an+UI2LLeD1DfxiD+keytnFBiCrtZqx3qu8OmM5HR8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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