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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d026a95a7220262d4d1ac648e894f20cbd6ced0c7dfd7953a52af6d90d573d' 
  AND token = 'zSazaoZymoy9JTAo+7ylPbElSN3bmeqa4blicFXhQgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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