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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f5c0e0a490d4c523c9b14ab2df3d23e12d54e1b4bfee4008ea68a63501465b7' 
  AND token = '8yNApWBlTNt2eVUoFMAuo8HWVMUzLtbz0rmhEzy17Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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