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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a6962ea7df2e52fe721afaede2d3530bcdb4bd61c7845f390ddb711006d3dc' 
  AND token = 'x8MIjvjcxB8P+jEtAkko4z3dN9Smvck2G2ioaiZksIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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