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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2432d13b2e11dfbcc09cac713ff9b11aa1ebe34ab880a413e4f0b580d30ef51b' 
  AND token = 'uxUum5TZhmQtsxQ8zDPxU67e4H5NMSVrxirIBYfWu38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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