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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d90e18d21c9fbd59a539e8ddadb7f92be792db97abffea0db602180da3c2f3' 
  AND token = 'QSDYLvPvT59YPUWn5clo/oBposYFPA+NMULO7m0G/g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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