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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7d7e617e0b0f6e5d0d1f4a9363866af5746673eef2f9beecef35e139245211' 
  AND token = '5JVboyKRZQW7K+oyBSqiFLMtCUJ6+tQHDO3z+rSVUV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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