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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137720cf42265586eb4bdf2b218594c897305b57c12d1202f59da8ab12c42c99' 
  AND token = 'w0/KIu1uClJnTBI4D9X4kV8AiPlDgsExziF56KfG2eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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