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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '601675ebdbe9a5e03b06bafa3a871f6a2c1d5238ac2d9a4124cff3d0e1a0387d' 
  AND token = 'GbCgBo1XCievS95wJccH6It/mk2xMRoAWSF/FUB4erA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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