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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6f56bdcacb2c83a696a6b9694e372e0ef740e8efb71c132b8a127bbbe27e16' 
  AND token = 'faAWZugCi/qIrEsG4S7vjIvOBs0pY3mI0lnJbhCGLiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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