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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee5de7919ac500fbc7f8673968ed648dcd76034d415bccc3f36eefcca631e30' 
  AND token = 'T9+OL2y1ca9PFXhk6Suh5JatWk1iLiG59cF8kdoXpQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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