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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae10f7b207d1bf0838bbb6aba35a5860505d5baadf5f8330cfd2d0540cc68cff' 
  AND token = 'WHcZ2e0JP4Hh4JkcVMeDPt4vI8cxCf1E5OmSABhcUfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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