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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94f4f33eeed41bf84b4ef6b4c6defc54833f77ed60953ef97e4e2cce47a8dda' 
  AND token = '8aNiLoytJ31cKrQKaNJzSGPCcJ5u6t67FogNFT3F8Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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