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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0ee7dee2162cd737086a4b19e6385a87e75912279e8c69dc9302eff98ce060' 
  AND token = 'SR05KMsULb1fg8sN26EbF0m4jvDdPrDdE0eop4eTpU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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