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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55e0f215d2c473e1b489cc1ac44b8f8aecfdf881d7fc568b86d29bd114d523c' 
  AND token = 'n6nDYhvwcAuGXFH6c1xfk7gg8dWH88ymJg32InRYBGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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