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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215df387b75e7e83eb9e22be2270d9f6cd358040c388148a26041c330eb3d080' 
  AND token = 'kyFqOrdyJGCdYoXpuqELrw/G6F3ujU9eqEeRnBr0GXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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