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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a94108c1d1c491b8f109b9afc3425259a5b2d573a83423fe86c18847ba1e50' 
  AND token = 'IJBh8bJWhehempVMBtVE+x+WL062SsrPavyl9etVGy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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