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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789fb28c56f61c0c21d60a93e3f62894c0c2fecf74840050085439f4f840d355' 
  AND token = 'sbJJitpTEje6tskjtcnC1X76IGcFknJzDqNwbdxODr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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