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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '921e9c3f756a6bcd7578b337b5db98c91445bc4613c4c9402968544f41d03cad' 
  AND token = 'lvwCXBuoQFfBCTisFFMG4g4kP9qU4fqburltm4QEXuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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