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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa93d8871323d392e4a555cb90cd245e6bab5143de4e325fa5b7965fae24720c' 
  AND token = 'XcZcTwgcA/tzwPh2RTtUXIMJEDr4g2rVPscD23p86vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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