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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04f97c3d4c402a71dbe57f9e7c3aba0568b623a73602be0b947ca477856299d' 
  AND token = 'PGlHsKq+3l+xMyZMoRAlE9weDQeBDDAWhRb2cjCyq+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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