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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be84e6c1d2cbc918ea7b903c8d213ee7d183d5d559baf220c37bc99fce23ddfc' 
  AND token = 'zSIjO6Hr9MnX2Y2OdeaxRq68v6uMwSU+MREVsIhgvh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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