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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a4f948f20a61cdd3cefb63e8f60c83315428f6106d19c4c02e36de8f9e062d' 
  AND token = 'WcgYwCSR5sPbH0CtfOX3D6WgzANsG3MVE36KiVgnfJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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