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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd92e5b4934a457066149d7b475a1023aa68a8cd32d3667d6d09872f0692425ed' 
  AND token = '0fy5VqwO4kjH9AcnT77gAaiHsdRSoxKewYU8hpt0mD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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