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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60bba3b2618efdde888d3171eea0306f2e38fb4c5b013d28f95073b7deb38ff' 
  AND token = 'IG/zzGC5jJ1vUx1dnMSBEwiuab46JVSzUb+ixDgBHio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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