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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09d4052b3225b05a7ada7727312a8ba750fe223c36cfde79f40a8ac5f6bbbff' 
  AND token = '1gx3JLtxCy3PparI6jWijGumkcSGf5JRRi3XqMZQoss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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