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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8b09f44fd79f21b20ca46ae1ddc74a104ef7cdcb210f62db3547df835bd39e' 
  AND token = 'A8UAKERAKGXj6UzPLFbrDWTSU5B1m+EoyDIS227rSIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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