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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01b62ed9749b5795918fb9e034346fd7485e627af2cb2f9b830ce26ad70c12e' 
  AND token = 'S2z2ymdeU3TAD9Cra3cBigLZuFrWNH5OkMCHjqhf/Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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